Protective over-layer coating preventing cracking of thin films deposited on flexible substrates

J. Musil, J. Sklenka, J. Prochazka

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The article reports on a special over-layer which protects brittle coatings deposited on flexible substrates against cracking during bending. It is shown that the over-layer with (i) the low effective Young's modulus E*=E/(1-ν2) resulting in a high ratio H/E*≥0.1, (ii) the high elastic recovery We≥60% and (iii) the compressive macrostress (σ<0) deposited on a brittle coating can prevent its cracking during bending; ν is the Poison's ratio and H is the hardness of the over-layer. The possibility of how to prevent cracking of the brittle coatings is demonstrated experimentally. The over-layer was deposited on the brittle coating which easily cracks when the flexible substrate is bended. In this experiment the Zr-Si-O coating with low ratio H/E*<0.1, low value of We≈50% and tensile macrostress (σ>0) was used as the brittle coating and the highly elastic Zr-Si-O coating with high ratio H/E*≈0.1, high value of We≈70% and compressive macrostress (σ<0) was used as the over-layer. Both the brittle coating and the over-layer were prepared by the reactive magnetron sputtering using a dual magnetron. Besides, the mechanical behavior of the coating composed of three and four layers is described in detail. Obtained results can be used in the development of flexible coatings, strengthening of the surface of brittle materials, elimination of cracking of functional coatings and cracking at surfaces of bended materials.

Original languageEnglish
Pages (from-to)275-280
Number of pages6
JournalSurface and Coatings Technology
Volume240
DOIs
Publication statusPublished - 15 Feb 2014

Fingerprint

coatings
Thin films
Coatings
Substrates
thin films
brittle materials
Reactive sputtering
Brittleness
Magnetron sputtering
elimination
modulus of elasticity
magnetron sputtering
Elastic moduli
recovery
Recovery

Keywords

  • Mechanical properties
  • Nanocomposite coatings
  • Resistance to cracking
  • Surface cracking
  • Surface strengthening

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Protective over-layer coating preventing cracking of thin films deposited on flexible substrates. / Musil, J.; Sklenka, J.; Prochazka, J.

In: Surface and Coatings Technology, Vol. 240, 15.02.2014, p. 275-280.

Research output: Contribution to journalArticle

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